[C:1]([O:5][C:6]([N:8]1[C:12]2=[C:13]([Cl:18])[N:14]=[CH:15][C:16](I)=[C:11]2[C:10]([CH3:19])=[CH:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C([Mg]Cl)(C)C.[C:25](=[O:27])=[O:26]>O1CCCC1.C(OCC)(=O)C>[C:1]([O:5][C:6]([N:8]1[C:12]2[C:13]([Cl:18])=[N:14][CH:15]=[C:16]([C:25]([OH:27])=[O:26])[C:11]=2[C:10]([CH3:19])=[CH:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]To a solution of 7-chloro-4-iodo-3-methyl-pyrrolo[2,3-c]pyridine-1-carboxylic acid tert-butyl ester (200 mg) in dry tetrahydrofuran (4 ml) at −40° C. under an atmosphere of nitrogen, was added dropwise, a solution of isopropylmagnesium chloride (2M in tetrahydrofuran, 600 ul) and the solution stirred at −40° C. for 15 minutes. The solution was saturated with a stream of carbon dioxide gas and then diluted with ethyl acetate. The organic was extracted with saturated ammonium chloride followed by 1N sodium hydroxide solution. The combined aqueous was then acidified to pH1 with concentrated hydrochloric acid to afford a precipitate. The precipitate was filtered and washed with water until neutral. The solid was then sucked dry and dried over sodium hydroxide at 50° C. to afford the title compound (86 mg).
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